ImageOptim - Faster web pages and apps.
Imagecompressor.io - Tool to compress jpeg & png images online.
FILEminimizer Pictures - FILEminimizer Pictures compresses JPEG photos, TIFF, BMP and PNG images and pictures by up to 98%.
TalkJarvis Image Compressor - Online Image Compressor – Compress any type of image online
Shrink O'Matic - Shrink O'Matic is an AIR application to easily (batch) resize (shrink) images.
HitPaw Compressor - HitPaw Compressor is the most effective and powerful software that can easily compress videos or images with several clicks in seconds.